Figure they do at gun showshere in Reno.
This is true, California cops watch California citizens buying guns & ammo in Nevada, it used to be just at gun shows.
“CA DOJ agents have been known to unscrupulously surveille Nevada gun shows to identify California buyers purchasing items prohibited in California and then have them stopped by CHP or local law enforcement once they have crossed the border. If you are at a gun show or Nevada retailer, be very careful not to give these agents any probable cause.”
https://nevadacarry.blogspot.com/2018/01/californians-buying-ammo-in-nevada.html